Bump k8s modules to 0.18.1

[shu-mutou]

Also, bump golang to 1.13.9

[codecov]

Codecov Report

Merging #5058 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5058   +/-   ##
=======================================
  Coverage   45.42%   45.42%           
=======================================
  Files         214      214           
  Lines       10078    10078           
  Branches      100      100           
=======================================
  Hits         4578     4578           
  Misses       5232     5232           
  Partials      268      268           

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[maciaszczykm]

Great. Thank you for keeping a look on this.

/lgtm

[k8s-ci-robot]

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